Uysal, Gumrah, Vishnu Narayan Mishra, and Ertan Ibikli. “On Approximation Properties of Multivariate Class of Nonlinear Singular Integral Operators”. Journal of Progressive Research in Mathematics 13, no. 2 (April 4, 2018): 2273-2281. Accessed April 27, 2024. http://scitecresearch.com/journals/index.php/jprm/article/view/1447.